Sleeping a back pain straight up, can be caused by the following reasons: 1, lumbar dorsal myofasciitis, lumbar dorsal myofasciitis is often due to cold, exertion and lead to, then there can be symptoms of back pain, then to early checkups and inspections, to exclude other diseases to early diagnosis and early treatment; 2, lumbar muscle strain, lumbar muscle strain, can also be the morning lumbar muscle pain, do not dare to straighten the waist of the symptom in the activity for a while after a while can be improved. After a while of activity can be improved, this time to the early examination to diagnose, early physical therapy and oral drug therapy; 3, rheumatoid diseases, when rheumatoid involvement of the spine, can also have the symptoms of back pain after sleeping, this time to check the lumbar vertebrae X-rays, CT, as well as blood tests to diagnose; 4, the cause of ankylosing spondylitis, ankylosing spondylitis can also be the symptom of back pain after waking up, this time to check the sacroiliac joints, the lumbar spine and the spine, this time to check the lumbar spine, to diagnose. The cause is ankylosing spondylitis, which can also have symptoms of back pain after waking up from sleep.